Implement backup/restore test suite

[dymurray]

We want to enhance the E2E test suite to support ability to provision different types of applications and take backups and restores of the apps while verifying they are functional and if they are stateful the data is preserved.

Demo Applications:
https://github.com/konveyor/mig-demo-apps
https://github.com/konveyor/velero-examples

Workflow:

1. Provision CI cluster
2. Install sample application
3. Run backup
4. Verify backup successful
5. Delete application (namespace)
6. Run restore
7. Verify restore successful
8. Verify any stateful data was preserved

[dymurray]

For reference: https://github.com/konveyor/mig-controller/tree/master/tests